I'm thinking of getting a wifi only android tablet -- maybe the Samsung -- and then enabling the wifi hotspot on my EVO. It's $30 a month, and as far as I can tell, I can cancel and re-add it as much as I want, so it's like having off-contract 3G or 4G. I don't think I'll find an unlimited plan for better than $30 a month from any of the carriers, especially without a contract.